编写装饰器：

函数定义装饰器

def p_decorator(func):

    def wrapper(*args,**kwargs):

        return '<p>' + func(*args,**kwargs) +'</p>'

    return wrapper

@p_decorator

def get_text():

    return '欢迎学习'

if __name__ =='__main__':

    print(get_text())

//或：

def p_decorator(func):

    def wrapper(*args,**kwargs):

        return '<p>' + func(*args,**kwargs) +'</p>'

    return wrapper

def get_text():

    return '欢迎学习'

if __name__ =='__main__':

    html = p_decorator(get_text)

    print(html())

//修饰带参数的情况

def p_decorator(func):

    def wrapper(*args,**kwargs):

        return '<p>' + func(*args,**kwargs) +'</p>'

    return wrapper

@p_decorator

def get_upper_text(text):

    return text.upper()

if __name__ =='__main__':

    html = p_decorator(get_text)

    print(html())